explain why a ship made of steel floats on water but a steel needle sinks
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Generally, however, iron needles willsink in water because they are more dense than the water. ... The force that causes it to float is called buoyancy and its magnitude, as defined by the Archimedes Principle, is equal to the weight of the water displaced by the object.
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Because of buoyancy. A needle cannot stay afloat bcause the mass of water removed by it is lesser than the mass of needle itself. But the volume if a ship is much bigger, so the mass of water removed by it is greater than that of ship. The removed water creats an upward force on the object immersed in a fluid, which has to be greater that the weight of the object itself to make it float. In this case this it is greater in ship made of iron. That is why the bottom part of a ship is wide.
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